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Photo-induced current in n-AlGaAs/GaAs heterojunction channels driven by local illumination at the edge regions of Hall bar
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10.1063/1.4812293
/content/aip/journal/apl/102/25/10.1063/1.4812293
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/25/10.1063/1.4812293
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Band diagram of n-AlGaAs/GaAs heterojunction (a). Schematic drawing of diffusion current and laser illumination on Hall bar sample (b). Hall bar geometry and scanning lines of laser illumination (c).

Image of FIG. 2.
FIG. 2.

Measured photocurrent as a function of laser spot position , when the spot is scanned from S to Y pads. Simulated results for photocurrent (b) and including the effect of substrate conductivity (c).

Image of FIG. 3.
FIG. 3.

Simulated current flows for light illumination at the edges of S (a)and Y pads (b) and (c). (c) is the result with the effect of substrate conductivity.

Image of FIG. 4.
FIG. 4.

(a) Measured and (b) calculated voltages , , and at X, Y, and C pads as a function of laser spot position , when the spot is scanned from S to Y pads. The inset of (a) shows the measured voltages , , and as a function of the photocurrent . The solid circles and lines represent the cases for the light illumination and the external voltage source.

Image of FIG. 5.
FIG. 5.

Measured and calculated photocurrent (a) and (c) and voltages , , and at X, Y, and C pads (b), (d) as functions of laser spot position , when the spot is scanned from C to D pads.

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/content/aip/journal/apl/102/25/10.1063/1.4812293
2013-06-26
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Photo-induced current in n-AlGaAs/GaAs heterojunction channels driven by local illumination at the edge regions of Hall bar
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/25/10.1063/1.4812293
10.1063/1.4812293
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